NEA-0450 SOTHIS.

SOTHIS, PWR Fuel Cycle Equilibrium Cost Evaluation

NAME OR DESIGNATION OF PROGRAM, COMPUTER, NATURE OF PHYSICAL PROBLEM SOLVED, METHOD OF SOLUTION, RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM, TYPICAL RUNNING TIME, UNUSUAL FEATURES OF THE PROGRAM, RELATED AND AUXILIARY PROGRAMS, STATUS, REFERENCES, MACHINE REQUIREMENTS, LANGUAGE, OPERATING SYSTEM OR MONITOR UNDER WHICH PROGRAM IS EXECUTED, OTHER RESTRICTIONS, NAME AND ESTABLISHMENT OF AUTHOR, MATERIAL, CATEGORIES

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1. NAME OR DESIGNATION OF PROGRAM: SOTHIS.

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2. COMPUTERS

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Program name	Package id	Status	Status date
SOTHIS	NEA-0450/01	Tested	01-JUL-1976

Machines used:

Package ID	Orig. computer	Test computer
NEA-0450/01	UNIVAC 1106	UNIVAC 1106

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3. NATURE OF PHYSICAL PROBLEM SOLVED

PWR equilibrium cycles are studied for fuel management performances. The feed enrichment or the cycle length is determined when another item and the reload are specified. Several fuel cost evaluations are done according to the economic data sets supplied.

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4. METHOD OF SOLUTION

The neutronic problem is solved by a simple and original method called approximate balance of reactivity. Two procedures, direct and iterative, can be selected to accomplish it.
The economic method calculates the direct and indirect costs by the usual division into 10 items, whose values are derived from the input data and the neutronic results.

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5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

The reload and enrichment specifications must follow the instructions given in the user's manual (ref. 1).
The number of cycles to study, the number of enrichments and other variables are restricted up to some maximum values but they can easily be modified by means of the DIMENSION statements.

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6. TYPICAL RUNNING TIME

Less than half a second for a neutronic problem, and almost the same time for five economic problems, in CPU time for UNIVAC 1106.

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7. UNUSUAL FEATURES OF THE PROGRAM

The program is very much suited for sensitivity analysis of the major variables involved in the neutronic and economic performances of PWR. Cases may be run consecutively, and data required as input can easily be obtained from very simple lattice cell calculations.

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8. RELATED AND AUXILIARY PROGRAMS

CICLON, which solves the same neutronic problem with a similar method, but for transition cycles (ref. 2).

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9. STATUS

Package ID	Status date	Status
NEA-0450/01	01-JUL-1976	Tested at NEADB

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10. REFERENCES

- M.R. Corella and J.M. Martinex-Val:
  'SOTHIS. A Program to Calculate Feed Enrichments and Fuel Costs of PWR Equilibrium Cycles'
  Report JEN-303 (1975).
- J.M. Aragones:
  'CICLON. A Neutronic Program for Fuel Management Studies of PWR Transition Cycles with Approximate Balance of Reactivity,
  Regionwise Burnup Sharing and Discharge Isotopics Calculations.'
  Report, JEN, to be published.

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11. MACHINE REQUIREMENTS: UNIVAC 13k core. On-line printer.

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12. PROGRAMMING LANGUAGE(S) USED

Package ID	Computer language
NEA-0450/01	FORTRAN-IV

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13. OPERATING SYSTEM OR MONITOR UNDER WHICH PROGRAM IS EXECUTED: EXEC-8 system of the UNIVAC 1100 series.

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14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS

ANY OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS

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15. NAME AND ESTABLISHMENT OF AUTHOR

      M.R. Corella and J.M. Martinez-Val
      Reactor Technology Division
      Junta de Energia Nuclear
      Avda. Complutense, 22
      Madrid-3
      Spain.

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16. MATERIAL AVAILABLE

NEA-0450/01